Need help figuring out some math equations

Franco wants to double the volume of the cone. what should he do?

Aperpendicular bisector, cd is drawn through point con ab if the coordinates of point a are (-3, 2) and the coordinates of point b are (7,6), the x-intercept of cd is point lies on cd.

What are the solutions of the system? solve by graphing. y = -x^2 - 3x + 2 y = -2x + 2